scholarly journals Electrochemically Identified Ultrathin Water-Oxidation Catalyst in Neutral pH Solution Containing Ni2+ and Its Combination with Photoelectrode

ACS Omega ◽  
2017 ◽  
Vol 2 (2) ◽  
pp. 432-442 ◽  
Author(s):  
Sung Ki Cho ◽  
Jinho Chang
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Neutral Ph

scholarly journals In Situ EPR Characterization of a Cobalt Oxide Water Oxidation Catalyst at Neutral pH

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 926 ◽  
Author(s):  
Yury Kutin ◽  
Nicholas Cox ◽  
Wolfgang Lubitz ◽  
Alexander Schnegg ◽  
Olaf Rüdiger
Keyword(s):  
Cobalt Oxide ◽  
Water Oxidation ◽  
Large Scale ◽  
Low Cost ◽  
Operating Conditions ◽  
Oxidation Catalyst ◽  
O2 Evolution ◽  
Ligand Field ◽  
Neutral Ph

Here we report an in situ electron paramagnetic resonance (EPR) study of a low-cost, high-stability cobalt oxide electrodeposited material (Co-Pi) that oxidizes water at neutral pH and low over-potential, representing a promising system for future large-scale water splitting applications. Using CW X-band EPR we can follow the film formation from a Co(NO3)2 solution in phosphate buffer and quantify Co uptake into the catalytic film. As deposited, the film shows predominantly a Co(II) EPR signal, which converts into a Co(IV) signal as the electrode potential is increased. A purpose-built spectroelectrochemical cell allowed us to quantify the extent of Co(II) to Co(IV) conversion as a function of potential bias under operating conditions. Consistent with its role as an intermediate, Co(IV) is formed at potentials commensurate with electrocatalytic O2 evolution (+1.2 V, vs. SHE). The EPR resonance position of the Co(IV) species shifts to higher fields as the potential is increased above 1.2 V. Such a shift of the Co(IV) signal may be assigned to changes in the local Co structure, displaying a more distorted ligand field or more ligand radical character, suggesting it is this subset of sites that represents the catalytically ‘active’ component. The described spectroelectrochemical approach provides new information on catalyst function and reaction pathways of water oxidation.

Core–shell CoFe2O4@Co–Fe–Bi nanoarray: a surface-amorphization water oxidation catalyst operating at near-neutral pH

Nanoscale ◽  
2017 ◽  
Vol 9 (23) ◽  
pp. 7714-7718 ◽  
Author(s):  
Xuqiang Ji ◽  
Shuai Hao ◽  
Fengli Qu ◽  
Jingquan Liu ◽  
Gu Du ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Core Shell ◽  
Neutral Ph

Water Oxidation Catalyst via Heterogenization of Iridium Oxides on Silica: A Polyamine-Mediated Route To Achieve Activity and Stability

ACS Catalysis ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 5699-5705 ◽  
Author(s):  
Nagaraju Shilpa ◽  
Joydeb Manna ◽  
Parasmani Rajput ◽  
Rohit Kumar Rana
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Iridium Oxides

Synthesis of nanostructuredβ-Ni(OH)2by electrochemical dissolution–precipitation and its application as a water oxidation catalyst

2016 ◽  
Vol 27 (27) ◽  
pp. 275401 ◽  
Author(s):  
Sang Cheol Jung ◽  
Soong Leong Sim ◽  
Ying Woan Soon ◽  
Chee Ming Lim ◽  
Peter Hing ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Electrochemical Dissolution

A Nickel(II) Complex as a Homogeneous Electrocatalyst for Water Oxidation at Neutral pH: Dual Role of HPO42−in Catalysis

ChemCatChem ◽  
2016 ◽  
Vol 8 (20) ◽  
pp. 3287-3293 ◽  
Author(s):  
Jia-Wei Wang ◽  
Xiang-Qiong Zhang ◽  
Hai-Hua Huang ◽  
Tong-Bu Lu
Keyword(s):  
Water Oxidation ◽  
Dual Role ◽  
Neutral Ph

scholarly journals Ligand Modification Transforms a Catalase Mimic into a Water Oxidation Catalyst

2014 ◽  
Vol 53 (37) ◽  
pp. 9856-9859 ◽  
Author(s):  
Wei-Tsung Lee ◽  
Salvador B. Muñoz ◽  
Diane A. Dickie ◽  
Jeremy M. Smith
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Ligand Modification

A Biomimetic Copper Water Oxidation Catalyst with Low Overpotential

2013 ◽  
Vol 136 (1) ◽  
pp. 273-281 ◽  
Author(s):  
Teng Zhang ◽  
Cheng Wang ◽  
Shubin Liu ◽  
Jin-Liang Wang ◽  
Wenbin Lin
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Copper Water ◽  
Low Overpotential
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